Low Testosterone And Dementia? Connection Between Low Testosterone And Dementia

Low testosterone has been associated with a higher incidence of dementia and Alzheimer’s disease in men, but current research does not show that it causes either condition. A large UK Biobank study found greater risk among men with the lowest total testosterone levels. Testosterone replacement therapy has not been proven to prevent dementia or reverse cognitive decline.  

Low Testosterone And Dementia? Connection Between Low Testosterone And Dementia
Medically reviewed

Dr. Chrysoula I. Liakou MD, PhD Google Scholar LinkedIn

Internal Medicine Specialist
Cancer Immunology Researcher

What Research Shows About Low Testosterone, Cognitive Decline and Dementia Risk


Men with low testosterone levels may experience symptoms of depression, anxiety, mood swings, and irritability. Still, there is a possibility of more concerning cognitive issues associated with poor male hormone health.


Scientific data that is collected and analysed according to scientific principles has found connections between clinically low testosterone levels and dementia and Alzheimer's disease.



Low Testosterone And Dementia: The Research


Scientists from the University of Western Australia in Perth recently made a discovery published in the Alzheimer’s and Dementia journal. They used the EU Biobank, a publicly accessible biomedical database containing extensive genetic and health information on over half a million people in the EU, as their data source.


Researchers studied a total of 159,411 men between 50 and 73 years old. Out of this group, 826 were diagnosed with dementia, and 288 of those had Alzheimer's disease.


The data showed that men with lower testosterone levels were more likely to have dementia or Alzheimer's than those with higher levels, even when other factors were taken into account.


A decrease in the overall level of testosterone was linked to a greater likelihood of developing dementia.


This study is not the first to establish a link between dementia and low testosterone levels. Several smaller studies employing sound research methods have also reported similar findings. One such study can be referenced here.


The authors of this comprehensive study emphasised the significance of their results, stating that the associations observed were substantial. The consistency of the findings across various analyses reinforces the conclusion that lower total testosterone levels independently predict the risk of developing dementia in both middle-aged and older men with relatively good health.



What The Data Says About Low Testosterone And Dementia


Even though the study was comprehensive and its results were statistically significant and supported by other reliable studies, the conclusions we can draw remain restricted.


Research such as this reveals that certain diseases are commonly associated with one another. We cannot be sure that low testosterone levels contribute to cognitive decline in dementia.


The results of this study suggest that there may be a link between testosterone levels and the development of dementia or Alzheimer’s. However, it is not yet known whether Testosterone Replacement Therapy (TRT) would be an effective treatment for these conditions or if it could protect an individual from developing them.


Studies suggest that treating low testosterone levels may decrease the effects of cognitive decline and dementia. This could offer medical professionals a potential way to improve the symptoms experienced by affected patients.


Further investigation of these possibilities is warranted.



The Alarm Bells You Should Be Hearing


The "average" European male should note these conclusions for several reasons. Firstly, low testosterone is increasingly diagnosed in younger men. This raises concerns about the potential for extended periods of untreated low testosterone levels, which could if a cause-and-effect relationship is confirmed, contribute to earlier cognitive decline.


However, it's important to emphasise that more research and data are required to fully comprehend the intricacies of the connection between low testosterone and dementia.



Learn The Health Risks Of Low T And What You Can Do To Prevent Them


As part of your overall well-being, we would like to provide you with scientific evidence that highlights the adverse health effects for men who have untreated low testosterone. This information will help you make informed decisions about your health.


It's important to note that low testosterone is not all negative. If you have been diagnosed with this condition, there is still hope. The button below will provide you with information on the health risks associated with untreated Low T and the available treatment options.


Mobi Doctor can provide assistance and guidance for individuals concerned about low testosterone levels and their potential impact on cognitive health. Their healthcare professionals can offer insights and personalised support to address these concerns.



Low Testosterone, Dementia Risk and Cognitive Health FAQs

Lower testosterone is associated with a higher incidence of dementia and Alzheimer’s disease in men. However, the relationship is observational: low testosterone may be a risk marker, a consequence of other health problems or one part of a wider biological pattern. Dementia has many contributing factors, so testosterone level alone cannot predict who will develop it.

The UK Biobank study followed 159,411 community-dwelling men with a median age of 61 for about seven years. During follow-up, 826 developed dementia, including 288 with Alzheimer’s disease. Compared with the highest testosterone group, the lowest group had a 43% higher adjusted hazard of dementia and an 80% higher adjusted hazard of Alzheimer’s disease.

No, the study does not show that low testosterone directly causes dementia. Researchers measured testosterone at baseline and observed later diagnoses, but participants were not randomly assigned to different hormone levels. Ageing, metabolic disease, vascular health, chronic illness and other unmeasured factors could influence both testosterone and cognition, while early disease processes could also affect hormone levels.

Low testosterone can be accompanied by fatigue, low mood, reduced motivation, sleep disturbance and difficulty concentrating or remembering. These symptoms are non-specific and are not the same as dementia. Progressive memory loss, language problems, confusion or difficulty managing familiar daily tasks requires a broader assessment because depression, medicines, thyroid disease, infection and neurological conditions can cause similar changes.

Testosterone replacement therapy has not been proven to prevent or treat dementia. In a randomised trial of older men with low testosterone and age-associated memory impairment, one year of testosterone treatment did not improve verbal memory or other cognitive functions compared with placebo. TRT should therefore be considered for confirmed symptomatic hypogonadism, not prescribed solely to protect memory or reduce dementia risk.

Low testosterone is diagnosed from compatible symptoms together with consistently low blood-testosterone results, not from memory complaints alone. Guidelines recommend measuring total testosterone in the fasting morning period and repeating an abnormal result on a separate day. Depending on the findings, sex hormone-binding globulin, calculated free testosterone, luteinising hormone, follicle-stimulating hormone and prolactin may help identify the cause.

Several shared health factors can influence both testosterone levels and cognitive health. Ageing, obesity, type 2 diabetes, metabolic syndrome, chronic illness, poor sleep, depression and certain medicines may lower testosterone, impair concentration or increase long-term dementia risk. This overlap can partly explain an observed association, which is why hormone results should be interpreted alongside cardiovascular, metabolic, mental-health and medication factors.

Persistent or worsening memory changes should be assessed when they affect work, finances, conversations, planning or familiar daily tasks. Gradual forgetfulness does not automatically mean dementia, and treatable causes such as depression, thyroid disease, infection or medication effects should be considered. Sudden confusion, especially with weakness, speech difficulty, severe headache or reduced consciousness, requires urgent medical evaluation rather than a routine testosterone review.


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